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Article published 2015 via International Conference on Stone and Concrete Machining (ICSCM)

The last ten years have seen a step-change in the ability to position diamond particles in metalmatrix
segments for drilling and sawing applications. Advances in segment assembly technology
allow diamonds to be positioned at specific locations within the segment. Performance of the
segment can be optimized when the diamond particles are themselves selected to best exploit
arranged-diamond segment design and other cutting conditions (such as tool drive parameters).
Diamond ‘grit’ products for stone and construction...

Article published 2015 via International Conference on Stone and Concrete Machining (ICSCM)

Due to their abrasive qualities, machining of hard and brittle materials is predominantly performed
using tools with geometrically indefinite cutting edge. However, these processing
methods offer only low productivity, which often can be increased by superimposing ultrasonic
vibrations to the process. At the same time this hybrid process design involves great uncertainties,
as influencing factors and the mechanism of action are not sufficiently described
yet. In order to close this knowledge gap, firstly the occurrences...

Present absences and absent presences, both in material and discursive shapes, provide insights into the social and political dimensions of infrastructures and their processes of planning, implementing and stabilising. Taking the case of a transport system in Dar es Salaam (DART) whose planning and implementation process is highly intermittent, this article illustrates how the bus system exists in a constant (re‑)making by its (non‑)human actors. Due to translations of ideals, social interactions, and negotiations of...

This theoretical-methodological essay seeks to answer the question, “How can one make sense of a messy object?” The denomination “messy” refers to a situation in which the object of ethnographic research is interpretatively complex to such a degree that the ethnographer may become trapped in the attempt to capture all of the various facets of the object at once (Law & Singleton, 2005). We focus on blood as a messy object and study it in...

Article published 2017 via International Association for Cryptologic Research

This paper serves as a systematization of knowledge of linear cryptanalysis and provides novel insights in the areas of key schedule design and tweakable block ciphers. We examine in a step by step manner the linear hull theorem in a general and consistent setting. Based on this, we study the influence of the choice of the key scheduling on linear cryptanalysis, a – notoriously difficult – but important subject. Moreover, we investigate how tweakable block...

This paper gives a short overview of the current state of research of the study of Beta Israel history, including a response to two papers in this volume by Dege-Müller and Kribus and Krebs that deal with various Beta Israel sources.

In this paper, a new framework is developed for proving and adapting the recently proposed multiple-of-8 property and mixture-differential distinguishers. The above properties are formulated as immediate consequences of an equivalence relation on the input pairs, under which the difference at the output of the round function is invariant. This approach provides a further understanding of these newly developed distinguishers. For example, it clearly shows that the branch number of the linear layer does not...

By using terms and methods of historical research on social mobility, this essay looks at patterns of inter-generational mobility of elementary school teachers in North Rhine- Westphalia after World War II. The discussion focuses on the long-term historical changes in the social recruitment of teachers in the course of the 20th century, considering the enormous professionalization of the working field. Previous research has stated that teaching offered vast opportunities for upward career advancements at the...